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Ubitx v4 Raduino goes into Band Select menu during modulation

 

?Dennis Yancey
4:22am???

I have a v4 uBitx. I just installed the SM2166 mic preamplier per instructions on ubitx website.?
The radio works very well except this. If I try to push the mic preamp over a 2-3 watt output on 40 meters, the Raduino acts like I pushed the menu button and thinks I want to change the band. The TX continues and the output can be adjusted to be as high as 20 watts with this board. the CW output is around 20 watts on 40 meter. Simply pushing the menu button will clear this error when the TX is finished. If I adjust the mic preamp down to the point it won't do this I have less output than I did before.?

Any suggestions would be most helpful.?
Thanks.
--
72 and God bless
KD4EPG
 

I had the same issue, however on 20m.? Traced it to rf riding the coax braid back from an off center fed dipole (MFJ-2010).? Solved it by grounding the shield before the radio, and placing a ferrite snap on core over the coax (RG8x) between the ground point and the connection to the radio.

Tried the ground only first, and it helped (could raise the power out to 6 watts), then added the ferrite to get it back to peak at 14 watts without causing the menu selection.? I did not have any issues on 40m.

My setup (using RG8x, PL259 connectors and PL259 Lightning arrester for grounding) is:

uBitx ======== SWR/PWR Mtr== Arrester ======== OCFD
? ? ? ? ? ? ? ? ^? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?^
? ? ? ? ? ? Ferrite? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Ground (water pipe in basement)

Hope that helps.

Evan
AC9TU

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